Short answer: the Partybox Ultimate if you want the deepest bass available and always have it near an outlet; the Bromley 750 if you need it to actually run on battery. These rank #12 and #2 out of 12 large-party speakers, at $999.95 and $1,499.95, with the Partybox Ultimate costing $500 more.
The Partybox Ultimate has no battery at all - it’s mains-power only. That’s the real dividing line between these two, more than sound quality: the Bromley 750 runs 40-plus hours cordless, while the Ultimate has to stay plugged in. In exchange, the Ultimate is rated at 1100W against the Bromley 750’s 400W, and our own notes call it the absolute deepest bass of any Bluetooth speaker we’ve covered - a category the Bromley 750 doesn’t compete in, given its own notes flag its bass as not particularly deep and its frequency response as unremarkable.
Both are wheeled and heavy - the Ultimate is the bigger of the two at 39 kg (86 lbs) against the Bromley 750’s 23.9 kg (52.7 lbs) - and both take guitar and karaoke-style microphone input, with the Bromley 750 adding true XLR-level jacks the Ultimate doesn’t have.
Buy the Partybox Ultimate if raw bass depth is the priority and portability isn’t. Buy the Bromley 750 if you actually need it to run away from an outlet.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Marshall Bromley 750 | JBL Partybox Ultimate | |
|---|---|---|
| Price | $999.95 | $1,499.95 |
| Ranked | #12 of 12 in Large Party Size Portable Bluetooth Speakers | #2 of 12 in Large Party Size Portable Bluetooth Speakers |
| Aux Input | Yes (3.5mm, RCA) | Yes |
| Battery Life | 40+ hours (Manufacturer specified) | No Battery |
| Bluetooth Codecs | SBC, AAC, LC3 | SBC |
| Guitar Input | Yes | Yes |
| IP Rating | IP54 | IPX4 |
| Microphone Input | Yes (2x XLR/6.35mm combo) | Yes (Karaoke mode with echo effect) |
| Power Bank | Yes (USB-C) | Yes (USB-A, 5V/2.1A) |
| Power Input | USB-C | AC Power cord |
| Weight | 52.7 lbs (23.9 kg) | 86 lbs (39 kg) |
| XLR Input | Yes (2x combo) | - |
| App | Yes (Marshall Bluetooth app) | Yes |
| Built-in Microphone | No | No |
| EQ | Yes | Yes (3 band) |
| Party Mode | Yes (Auracast) | Yes (Auracast) |
| Stereo | Yes | Yes |
| Omnidirectional | Yes | No |
| TWS | No | Yes |
| USB Playback | No | Yes |
| Wi-Fi | No | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 16.3” x 25.7” x 14” (413 x 652 x 355 mm) | 17.9” x 41.3” x 17.3” (455 x 1049 x 440 mm) |
| Drivers | 2x 10” woofers, 2x 5.25” mid-ranges, 2x 1” tweeters, 2x 0.8” tweeters | 2x 9” subwoofer, 2x 4.5” midrange, 2x 2.75” tweeter |
| Amplifier Power | 400W | 1100W |
| Digital Aux Input | Yes (USB-C) | No |
| Removable Battery | Yes | - |
| Charging Time | 3.5 hours | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | - |
| Lights | Yes | Yes |
| Strap | No | No |
| Wheels | - | Yes |
Related Speaker Comparisons
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- Sony ULT Tower Max vs JBL Partybox Ultimate
- JBL Partybox 1000 vs JBL Partybox Ultimate
- JBL Partybox Ultimate vs Teufel Rockster 2
- JBL Partybox 720 vs JBL Partybox Ultimate
- JBL Partybox 710 vs JBL Partybox Ultimate
Prices on this page were last checked September 26, 2026 at 11:14 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
Marshall Bromley 750: $999.95 Amazon eBay
Pros: Much wider, more consistent off-axis dispersion than the JBL Partybox 720, which only fires forward - the Marshall’s standout feature, sounding about the same from any angle.
Cons: Not as deep bass as the JBL Partybox 330 or JBL Partybox 720. Not a great frequency response overall, with some midrange peaks. Only basic bass/treble controls, no full custom EQ like the JBL Partybox 720’s app. Default bass (dynamic mode) is overdone out of the box and needs trimming.
Full Marshall Bromley 750 review and specifications →
| Amplifier Power | 400W |
|---|---|
| App | Yes (Marshall Bluetooth app) |
| Aux Input | Yes (3.5mm, RCA) |
| Battery Life | 40+ hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LC3 |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Charging Time | 3.5 hours |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 16.3” x 25.7” x 14” (413 x 652 x 355 mm) |
| Drivers | 2x 10” woofers, 2x 5.25” mid-ranges, 2x 1” tweeters, 2x 0.8” tweeters |
| EQ | Yes |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Guitar Input | Yes |
| IP Rating | IP54 |
| Lights | Yes |
| Microphone Input | Yes (2x XLR/6.35mm combo) |
| Omnidirectional | Yes |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Removable Battery | Yes |
| Stereo | Yes |
| Strap | No |
| TWS | No |
| USB Playback | No |
| Weight | 52.7 lbs (23.9 kg) |
| Wi-Fi | No |
| XLR Input | Yes (2x combo) |
- Links
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone: Marshall Bromley 750 vs JBL Partybox 720 - outdoor test More from Oluv’Sone →
- Storytripper HD: W-King T12 vs Marshall Bromley 750 More from storytripperhd →
- Danny Pops: I Finally Got The Marshall Bromley 750 Everyone Wanted More from DannyPops →
- Oluv Patreon: JBL Partybox 720 vs Marshall Bromley 750
- Oluv Patreon: Marshall Bromley 750 - battery issues in the cold
- Oluv Patreon: Marshall Bromley 750 & Teufel Rockster Air 2 - outdoor test
- Oluv Patreon: Marshall Bromley 750 - 2nd look after update
- Oluv Patreon: Marshall Bromley 750 - first impressions
- Head-to-Head Comparisons
- Marshall Bromley 750 vs Sony SRS-XV900
- Marshall Bromley 750 vs Sony ULT Tower 10
- Marshall Bromley 750 vs Sony ULT Tower 9
- Marshall Bromley 750 vs Teufel Rockster
- Marshall Bromley 750 vs JBL Partybox 520
- Marshall Bromley 750 vs JBL Partybox 710
- Marshall Bromley 750 vs JBL Partybox 720
- Marshall Bromley 750 vs Teufel Rockster 2
- See all 17 comparisons
JBL Partybox Ultimate: $1,499.95 Amazon B&H Photo Video eBay
Pros: A true large-venue party speaker: its 1,100W system, dual 9-inch woofers and six-driver array produce exceptionally deep, authoritative bass and very high clean output. Independent reviews praise its unusually clear, articulate sound at extreme levels. Wi-Fi streaming, app EQ, inputs for two mics/guitar, USB playback, Auracast, a polished light show and wheels make it unusually complete for karaoke and DJ-style use.
Cons: At 39kg and more than a metre tall, this is not casually portable despite the wheels. It needs AC power, has no battery and only IPX4 splash resistance. Reviews also note that its bass-heavy presentation can obscure fine detail and overwhelm a small room; its size and cost only make sense for very large spaces or frequent events. JBL’s wired daisy chain only works with other JBL speakers.
Full JBL Partybox Ultimate review and specifications →
| Amplifier Power | 1100W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | No Battery |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 17.9” x 41.3” x 17.3” (455 x 1049 x 440 mm) |
| Drivers | 2x 9” subwoofer, 2x 4.5” midrange, 2x 2.75” tweeter |
| EQ | Yes (3 band) |
| Guitar Input | Yes |
| IP Rating | IPX4 |
| Lights | Yes |
| Microphone Input | Yes (Karaoke mode with echo effect) |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-A, 5V/2.1A) |
| Power Input | AC Power cord |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 86 lbs (39 kg) |
| Wheels | Yes |
| Wi-Fi | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- GYMCADDY: JBL Partybox Ultimate Vs SOUNDBOKS 4 & Sony XV900 - Is It Worth It? More from GYMCADDY →
- GYMCADDY: JBL Partybox Ultimate Vs Partybox 710 - They’re Both Crazy, But There Is A Clear Winner
- Flossy Carter: JBL PartyBox Ultimate VS JBL PartyBox 1000 - Which Speaker is The BEST? More from FlossyCarter →
- GYMCADDY: JBL Partybox 720 Vs JBL Partybox Ultimate
- GYMCADDY: Sony ULT Tower 10 Vs JBL Partybox Ultimate & JBL Partybox 710
- M1MTechChannel: Vorsicht LAUT ⚠️ | Teufel Rockster 2 vs JBL Partybox 720 / Ultimate More from M1MTechChannel →
- M1MTechChannel: Welche JBL Partybox ist die BESTE ? Alle Partyboxen im Vergleich | 2026
- Head-to-Head Comparisons
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- JBL Partybox Ultimate vs JBL Partybox 710
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- JBL Partybox Ultimate vs Teufel Rockster
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- See all 16 comparisons